#pragma once
#include<assert.h>

namespace bit
{
	template<class T>
	class vector
	{
	public:
		typedef T* iterator;
		typedef const T* const_iterator;

		iterator begin()
		{
			return _start;
		}

		iterator end()
		{
			return _finish;
		}

		const_iterator begin() const
		{
			return _start;
		}

		const_iterator end() const
		{
			return _finish;
		}

		vector()
		{
		}

		template <class InputIterator>
		vector(InputIterator first, InputIterator last)
		{
			while (first != last)
			{
				push_back(*first);
				++first;
			}
		}

		vector(size_t n, const T& val = T())
		{
			reserve(n);
			for (size_t i = 0; i < n; i++)
			{
				push_back(val);
			}
		}

		vector(int n, const T& val = T())
		{
			reserve(n);
			for (int i = 0; i < n; i++)
			{
				push_back(val);
			}
		}

		// v2(v1)
		vector(const vector<T>& v)
		{
			reserve(v.capacity());
			for (auto& e : v)
			{
				push_back(e);
			}
		}

		void swap(vector<T>& v)
		{
			std::swap(_start, v._start);
			std::swap(_finish, v._finish);
			std::swap(_endofstorage, v._endofstorage);
		}

		// v1 = v3
		vector<T>& operator=(vector<T> tmp)
		{
			swap(tmp);
			return *this;
		}

		~vector()
		{
			delete[] _start;
			_start = _finish = _endofstorage = nullptr;
		}

		void reserve(size_t n)
		{
			if (n > capacity())
			{
				T* tmp = new T[n];
				size_t sz = size();

				if (_start)
				{
					//memcpy(tmp, _start, sizeof(T) * sz);
					for (size_t i = 0; i < sz; i++)
					{
						tmp[i] = _start[i];
					}

					delete[] _start;
				}

				_start = tmp;
				_finish = _start + sz;
				_endofstorage = _start + n;
			}
		}